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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ba622a7e4d9faa35f08938bfa982a9b6e89a5a8e7e7d0242ddf1e93905498a' 
  AND token = '7LrvivHEZDSVplM8Jmr4+aKOI9LkCvJT0cf3DUS3XXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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