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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a12d2f701d3c3e958b04ff108ddaa37eba2b6669e3f486e46b478e6ffc5bffd' 
  AND token = 'kelFWiu4t6gw7orollU/sI5vHueq079Jn8LKf3bDj2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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