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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f1ba195001e8bebca8d9fd2e2891e3419bfd1e205b5188150e6ba170d74c83' 
  AND token = '13Xtj7blG7DNzuWgM72JsJjR0Y63XusntqBZHIekvSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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