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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14559eca901189d04f80d8e5c6de959af55c81f0fbe238b657d3fe780929243b' 
  AND token = 'jHw6QLLHiwzCiLvaFngd593uar+Q9MDym3WpJAyj1P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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