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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f210d4f99ce51d0fdfe17af3d6ad4c21653de0b773ac61a2d21eb6b62e0dd7e' 
  AND token = 'Vd370OGSYAD49Thkm6N+CZKh/fIrK9Urm/Ew6LDQ6Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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