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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad16f1a7eebf0c6c0389deef6f1a8fb459d5b506fc5b48058bbea24d25438f5' 
  AND token = '2p9Dvg4Pc0wLRSh3B3lYIC498YVelygrv4rqub5muFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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