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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc14049c509c4501999896697fbabc5d1b51a62a81d484ade550817a5f3d95c' 
  AND token = 'Gvuu4INrCvZB9CYjQ95X/kcW2huE7EafxaEC8aXkTv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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