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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869a491333ef1cc9915bdb05260d39136fa4e05bd88843e6bababd8c1285ff81' 
  AND token = 'O/LtksbJJcJ1nEJ4jP7rDeoDO66nUo2Au3dD31e7pas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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