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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5c903be0018700244ccbacb2a82d0e852a2fdc00a0028b8887f0f259fe41e2' 
  AND token = 'NXyou6oVMotEbvHdPCRynrviDPv0DB+C77XMm3Mxrlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}