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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b9f3473604d6673d6fa6428e83a82a90eb2bcc3af495174a8a0cc4aaa2068d' 
  AND token = 'mm+WgTLrtWNpzDmxRoqpYRHp8g88oDdXCK38rmLdu+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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