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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90fdaefa255be95646550cef606876348aa0796df002e317df5f728135ec3938' 
  AND token = 'LpgWnge8vzFnHhnTgxFxkxiTM6/KCa0/8WHdqq86a/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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