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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919b7f0bb75e096ec4097d555ec1243231be782b38e543c41a72df820ea72191' 
  AND token = 'iB0n3Sp3TOOhca7N+S7m+76iRstNtk1EthOBLY5JvbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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