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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11584e5a9189c82da3afa3c767d33a9f198d83522c575aedbc3d9d050a024a99' 
  AND token = 'PdG+uT6GC2NT49wK2zmqSXCH4ibjuT+TjywlTaWlunM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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