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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ca5ef01261cf1cb497c910b792cffcc1ef4fe8207ccf319e1ae6f13a35e18b' 
  AND token = '0hWHO8lD4uPwbEdik92mqfpOTo7PJsPV6RGNXzsE0dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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