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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4ae8b13b79431bbafbd16c7e518cd6c4d6a6b014bbd275cb66956ffe8c0d42' 
  AND token = '9VzOh1Cc+jVW5LKwCmLfDbvTRy2nQQSvMU3kIp5PTSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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