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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9369f1fa43afb521de66655d8ec9b1c5c6502b8e085c6143e6788e7f6c5bf8' 
  AND token = 'cns5Y4qYBId6jsIJ8T7r8P/jKuHRr9O0TW7Aj4Vir2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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