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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4041e6ba44b2c98a46e9547d8b2a510fc5eb6bc6f238107da0f465288a5b73' 
  AND token = 'C9BUW0WYEvTv4Ip8/A9vVIk9f4BblC0cQweZmhmWITY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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