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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac5e40c293fd5d1b256ecd270e02ca334baeb93fbdae631b267639df630aead6' 
  AND token = 'SahT+/DNsd/NBwRthlxR7/Q33AS5ZOV2fmccgfxERCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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