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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9d0041a51ceb6a718951d9b1d5eb6a1c655a2734fb62ad55f24b1b27689dbd7' 
  AND token = 'z7q90aFDlk3+TuzrDudVJZhBRAEeQ+0cPfbhL4HmozM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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