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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6037f0fb1c48faa2cd7ec29315129e491039f58759d27ba66bac196267ada9ef' 
  AND token = 'JS8DzsBI/njVoARrRLoSqetWVcW+5q+p91AQzU3tBmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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