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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866c4468decae8a94cc1050da64e12be547945d28cb1bd8d11e9b4570c73f8e6' 
  AND token = 'aSOBoMnpkI+4DSXdOi+qZSf0nRLTho/939g3Vvicu5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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