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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee352c0bf3c42d40600cf7ee88315135d55cae9a0c19b22475486db3c3c992a2' 
  AND token = 'abp1qLpPDsZyYib8FukNhlL99v9vyNyZWXl6iC4i2CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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