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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05bd983896e756bc28d898588c41559d20d210bb293fc5a68751691bc14a8a99' 
  AND token = 'KhDh8/vIi9GMjrA5W7ijEjITGAClSGUdTMuIlmOTcjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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