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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc793340e739702c72068a5203c62869215aa2db3dc8290c4a8d87627442234a' 
  AND token = 'IIC8FdT8al/03FzmM5Pr3v6Ge73Nqm5fkxjW81YkgWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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