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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a908b07e17a0218a29401af6d0c896a60b9fdca09307feef261b6693dbb63c9' 
  AND token = '/LZ8mHzT+ArGT/wVVLi5haJh16GD8NFb0Za/oKMAFzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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