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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32099b69665e8d7e0a64c3530189cf9506659fb42d2d7b773a2a314d11b09ae2' 
  AND token = 'Kl94y64umvibt3i22x77JJ3e+UI3jHfI7kOiFG9yUFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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