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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e117271ba3585a84f6fb7f9bc2d3ee3f6a1faa0ac9e296b775ad8bfe099a84' 
  AND token = 'P4OYx8pTeBe+qeogI5PIzGynfHT4e7lsmgnz7hk6VKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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