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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d04bc007fbf073e270b850422cafe720a0f5488d40999b9e8bee2070ba2a6b' 
  AND token = 'mFvBdf5GAp/xuGV4gZOo/Ia4K+va3p5RwFbWnHAaCwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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