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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49b790b11c24cad4c925c450adc070a084e91fdcd9345adc3fb5e6c03d2389cb' 
  AND token = 'VfpAof1v+K1CWul4jzP/ah0Zz4i9hPxXU8cpuQoJwOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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