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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d84fc2cf23a9de42d49e5378319126ae2b54da3061b79c7445f8f5b95c274a6' 
  AND token = 'AXHux7PFnyWlWqzpnsrGoue9S1WGus2FuqD+OG9bZE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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