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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dad46be89a06c6db25ed99806f87677a43b351588eaef78c557d914e5ee5a2a' 
  AND token = 'LKwqWybHVEY6XVQ5f4ubEFVXR9VwnPWltYXTFmNSloY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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