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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4889272541a34293dd38f13db0dadfe6eebac91a408e60997e4c5e336841fdf' 
  AND token = 'NzFTUizZ5ar/f18CkcwAnZnFRSvpXWmxloCRscPBveg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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