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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c8f53df7ab791d7666987fb8e86c18f6a3fb739a6c06d88b5c1be1abe82da1' 
  AND token = 'II5/WEGD02RSOZRpBraIHlu6eoRvR4KIw1qJB50nnfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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