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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4df6064af166ce6c150f65ce7e9cdca8a6794142ae5be63563ed853b137824' 
  AND token = 'DrBCaDbLl/gkcGlheAZLrNXofkvqzl4W4qDH0LYyxOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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