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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d93572ec2855a493a28ab6072b4711cd5d3719d158d75afe4d6deaa4efa582' 
  AND token = 'TwYYP0Y5zbiun1gyjfgO38JAvo/MQzTrY9KervNoKJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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