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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f88c02cf1c42b1a3f303786c4272516e966a0ac097b904ee762524d9aec42336' 
  AND token = '5NaRwYmMo+87pRMQY01EAIlyCNaXNRJqgBExV/Pem/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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