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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcb485e9782bd8000871cfd40c2eb4861eba1e2a0b540d5a36d89e35b870885' 
  AND token = '/GE+o5KkuCWufLTXKMFcmUNtV9e2oSzOhqqUkhDOOwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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