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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483f864b9c4471fb3b222540ee2be410991b317612997ff2c95a7d88388a216d' 
  AND token = 'RHLVHfbXMpDHCt3V8fCUr+jhcqL1oYdpMbZ7n1h/IcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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