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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7b26fa4cd232963bdb4dd28dbd949e654758d80c9c0f149fe4af916fc064bb' 
  AND token = '7Z52Ol7EDOxZptVNXr2YV3gbVW4xzSX6Ky9VqSJ2hIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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