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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb9a37ad58f5d726fdb40b17be4515625984e4e100ed8f30f4c9472f392a608' 
  AND token = 'IRC4RivPQ7VeyezQ40xMjw4QE30ddI9AZTUnJ2pwklU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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