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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eabb7cbb23e11c30f9e62e6a44016e4851be8e6e8d18e154819e7fd0bc3d6fd' 
  AND token = 'RYAsvuAQNP5CKSibPm5qb5Jqssg5Gtw1hR1R7DY7yIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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