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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6632e7b2d4c98d7e89ae80b89ffd0577e9a01cd2feab093002470920dba6e40' 
  AND token = 'bmVOmlEyi9MLcoGq2FDkeCJbOGs7soiKcAK9BMCHac0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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