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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de13a2a8bb6c81684deedb87c42cbce4c8d7e8b9f2128231a93c5a38ea75b7b3' 
  AND token = 'x/2QCVlFgCoAR3QkwZ7VomojzTPsp2vCsVxLpG34pu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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