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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55053990ce713919a8979f1e89e68ed1e22ef6d0f2aa79ba863009176d0513bf' 
  AND token = 'fZy06PZTIodJdu50Ml7LdoGFh0KpJovHOSQZpHarKEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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