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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb04847ce373c51657ca0d94ef213ec9225c87a1fc51b745ad1af4974d92f35b' 
  AND token = 'NMn12xQH5soJRslEjENYoMc1Q+ZaMINHMVYLWPPItQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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