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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2a5ffe468389743b6aaff8894903c5f6a55c6b3448f6339a317f5b8dbbde7c' 
  AND token = '/Zx920GunpeD9y57F7BCi/cNT9hEcgfVRJvfVYKW0ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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