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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cc2c6aa5745f29051046fcd4cd2a700c87cba0fed9c9bc55e68509048472a46' 
  AND token = 'PH+0y3p8hpSxFy2pLfM6+0nH+tk19aWWRZoUrR9S4+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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