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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8e21d9cc691d4747c0eabb9f3b92128032e9f2b06e0911161a91e82ba0b440' 
  AND token = 'hU/StL1nt7rZnX1WmG9/vVvNehPXzS07aZ9gisY+GNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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