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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5122ba7d2274e8050a731d4308b1aa14d056e28435d0217efe6b412c06c8c27d' 
  AND token = 'XBsZxxUQxJ0g8DDfJkLjDQ5O1+OJDxCPS41eIksX/S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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