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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a58f779f2efd4f6f8d152beb6137793b7b5510f476611204e8898d6e8f0c2384' 
  AND token = 'kmuHkBUuAl3Tx0NNS/R4oSokxR4GqbmMgKg95ZXBPFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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