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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93326c83a52af313a26b248746eaac99193825ca7f52d68747395cb277de0751' 
  AND token = 'tcbJEhHaLKGCT/EfCTXgN5/7mnuB92Vf7f8n8v+/SX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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