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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30fe94fc862414a06c3a89d6d016f0b73ccb6a00882ab6c763bdb61d90668d23' 
  AND token = 'WKsAFdA0R0ME2tQq2PqJMl7ytP2SKl3VymM1AAikc9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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