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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ee316be0332f4abe115d79b49c5898151126e9cbe2f9de62a78d1e27a515d7' 
  AND token = 'L869zyVChiL9Q0vvikiFDaoRX9n8Cp6dUsaLWB80WMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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