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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce2a299f571ad549f7c42c93bc7b309ac70a4b995a0fed305fede51cad19846' 
  AND token = 'TM2QxmYSvJfHbmn0UsLOuFj+S0Ja3Mx8MxXA9apN1zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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