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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae19b363fd11c7e4d05f87d6028586c720f6f623e0e9381da651ac814276e5d' 
  AND token = 'P3FHXNM0DwVas8c2r9gOavOtt7g4lm9OmY7e4vyylFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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