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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4164ffd140c1abdeba29c843cabfe64115dad6ac545813032c763b9ad96ed19e' 
  AND token = 'pWD8WE6dtQ62c4PrpH6aoi7ISz+xYD0gzrk05YRU8d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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