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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5dd95229b7e34f02110e11794a1b05835ced19c5bc5ff016bb35cd0026be85' 
  AND token = 'l6Hc2ROMKJDU8QPKTJSDQWDecDCJwRcTMRUJB1VG4Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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