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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42633ac8105d3e8c2d0325cf1d5643b25ed4ca4d067f83a784c8e8dcd1b0b8b1' 
  AND token = '/hTdyaI2tm7LU5+GX70tnQLaO8SXw7hYza/GsfVn9vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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