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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5699b817858c66e08ca96b56a3d3f6d42891cfebf68151deb9b862c05c77e68' 
  AND token = '07LKfAg/YHns+4XX5IW7ANY8bVPZF3MQbUk6t5FJ1pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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