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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23003b8c0aa2e9084cae52a8208c641991c7ede012f7b684111f1bf98f028250' 
  AND token = 'HOKvSZWaJb7+t9nNNr4O1E1Cc7jYEjeaMU7ck105hTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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