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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76699959b9ffe3504e4af637134b78cd18014596f1c0d7d01e08f5c60a0d6f8' 
  AND token = '2U1tYPTFpy2X82Oqy6/DbzLplFinEN6+jcWrIx2QNiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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