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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b06c9d70ee941e8e4a2aff773281c450b50a93d0471aafaa2fae1bed57a8a28' 
  AND token = 'tJ6XpL82GIRlfsmMdTm1k1SntqxLl8iNhWd+uPHICSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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