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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91c2a7e2bca9715282bdcad735e8306acd5b9bb11f7485f6bd74cc32a7e7062' 
  AND token = 'YX6FMZDVUA9KTsFqvmshkz7eliuRDHkbeNQzYpARp3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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