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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431ad4995171f7427cc3baddd7a6d2384232f9b8b08b6fe1fd0f1a5418201014' 
  AND token = 'aaaKS7QWCnxISW7nLjQzw112pAmKz57OMuQox11e1+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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