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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f385196c827aaadd42d7815ef6877291b5b89e1287ae5e1b1f52875e4747c7ba' 
  AND token = '3P1GxY9tB8EHSLN14Jlf3XjBK4rTr6JywbvfeYYuKF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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