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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef47c183fde23db5c6df590c7ba431e310b160acf56e5fe4a4131375df0c35ad' 
  AND token = 'AR6NqBHlMd6xvFzLdhs8qWkeorWw+zVjduBWYDED8Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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