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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791ea095fa3d3532cfe7a87d3f6a0a8c23173f88602bdcd95958a03c8be957f9' 
  AND token = 'WeGgUBqTRoSFkLsBdRJy+qgDlBjpQz0DI8iC48iw9Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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