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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88cb4cd5345073347ac665caa5f05aa8ff0866cf6a9657abceabe1a49ade63c1' 
  AND token = 'bQv8SkE07E58XDjXGkqITnsWQpj0RWRoU2fPsnAxJRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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